Combining fonts

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Does anyone know a website where I can learn a bit about combining different fonts?
For example which serif goes with other sans serif. Or how to use script fonts properly. I am working on my wedding invitation these days, and I'm going for vintage navy style. Being client to yourself is a nightmare :/ This is something what I really like: http://ohsobeautifulpaper.com/tag/palm-papers/
Even a book about this could help too. Thanks in advance if anyone can help.

Oh wow so many information, thank you, I am starting my research today. Recently I discovered a beautiful font called Key http://www.myfonts.com/fonts/fw-alias/key/bold-lf/ and want to use it but don't know how to combine it with other fonts. Great, thank you again